What do insulin-like growth factors, neurotrophins, nitricoxide, and lymphokines have in common?
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Human Physiology
- Concerning the half-life of hormones,a. lipid-soluble hormones generally have a longer half-life.b. hormones with a shorter half-life regulate activities with a slowonset and long duration.c. hormones with a shorter half-life are maintained at more constantlevels in the blood.d. lipid-soluble hormones are degraded rapidly by enzymes in the circulatory system.e. water-soluble hormones usually bind to plasma proteins.arrow_forwardWhen a catecholamine or peptide hormone binds to receptors on the surface of a cell, A. The hormone is transported to the nucleus where it alters the activity of dna. B. The cell membrane becomes less permeable. C. The cell becomes inactive. D. A second messenger appears in the cytoplasm.arrow_forwardA hormone differs from a neurotransmitter in thata. hormones act extracellularly, whereas neurotransmitters act withinthe cell that synthesized them.b. hormones are released only by neurons, whereas neurotransmittersare released by many different types of cells.c. hormones cause only fast responses (seconds or less) to stimuli,whereas neurotransmitters cause slow responses (minutes to hours)to stimuli.d. hormones affect only epithelial cells, whereas neurotransmittersaffect only muscle cells.e. hormones are released into the bloodstream and can activate manycells in many parts of the body, whereas neurotransmitters arereleased by neurons and affect adjacent cells.arrow_forward
- Which of these statements about the hormone insulin is true? a.It is secreted by alpha cells in the pancreatic islets. b.It is secreted in response to a rise in blood glucose. c.It stimulates the production of glycogen and fat. d.Both a and b are true. e.Both b and c are true.arrow_forwardHow are epinephrine and noradrenaline related? I. They are synthesized in the adrenal cortex. II. They have a common amino acid precursor. III. They are both hormones and neurotransmitters. IV. They are cationic in nature. V. They bind to the same cell surface receptors.arrow_forwardWhich of the following is true about lipophilic hormones? a. They are freely soluble in the blood. b. They require a transport protein in the bloodstream. c. They cannot enter their target cells. d. They are rapidly deactivated after binding to their receptors.arrow_forward
- Which of the following statements about insulin is not true? a. The insulin receptor has tyrosine kinase activity. b. Insulin increases fat synthesis in adipose cells. c. Insulin increases glycogen synthesis d. Insulin increases gluconeogenesis reactions.arrow_forwardWhich of the following statements concerning insulin is NOT true? a. Insulin can increase glycogen synthesis. b. The presence of insulin can increase glucose uptake. c. Insulin can increase the secretion of epinephrine. d. It is secreted by the beta cell of pancreas. e. Glucose in blood can up-regulate the secretion of insulin.arrow_forwardWhich of the following correctly describes the hormone insulin? a. It is produced by B cells in the pancreas. b. It increases glucose uptake by liver and muscle cells. c. It is a peptide hormone. d. It lowers blood glucose levels. e. All of these are correct.arrow_forward
- Which of the following is a prohormone and can be converted to an active hormone as needed? A. Diiodothyronine , or T2. B. Thyroxine, or T4 . C. Triiodothyronine or T3 D. Thyroid-stimulating hormonearrow_forwardWhich of the following statements about steroid and non-steroid hormones is false?a. Non-steroid hormones typically act through second messengers such as cAMP.b. Non-steroid hormones are not lipid soluble and cannot enter the target cell.c. Steroid hormones act usually slower than non-steroid hormones.d. Cortisol and aldosterone are non-steroid hormones that are produced by the cortex of the adrenal glandarrow_forwardWhich of these is not a means by which hormones are eliminatedfrom the circulatory system?a. excreted into urine or bileb. bound to binding proteinsc. enzymatically degraded in the blood (metabolism)d. actively transported into cellse. conjugated with sulfate or glucuronic acidarrow_forward
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